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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc63aa67b01aadb0868cc8cc2a2542a3b560d05c9df9849b7b11c4443b7493f2' 
  AND token = 'xJOpzRCBNvZjrGys15ua3PFxDHvHV3z0F6c4A18onTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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