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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64d657948451b85462e99076db0687c4926ca6620533e23924ad344844ed4960' 
  AND token = 'GP0gChwjrIPw5VpZjtAdnXDKiy0hCw6XbzJBd9mMYQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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