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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd94219923b1a6a389e5eb0decb76bc35a5238d499297bd9f5c8f6436702d326a' 
  AND token = 'saE7sZlUQJS/1k12WiR3IiI9HfRTkHjN5etuc3aPW1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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