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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b524b949e465db812e4b3ca6bd0210ea9d2f248bde8a285893515410e9ac75c' 
  AND token = 'ZBE7ye3gKnHCZArwJiMjmAk8E9xyQov+7smUNZk+3p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}