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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdfc6c7c5e7ca8ac6eb7198b07ece7c8d38b1fa91a707441936c592373fc5752' 
  AND token = 'ryjFU/Cd+VWrmSaKnT+fekApeUkmck+QX7Drm+Sv8cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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