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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0d713d757dbd5af85b82eb7e8cf970fca914d01cb550ddd8316a57956242870' 
  AND token = 'YsRGxOGFcMgQxmtIHBmYV2YXqMdW6n2sMu32ug3IpkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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