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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '700a290eb85a0008c9a08e60dd7103fd80110e0e49a2d9218a75859943fe11a7' 
  AND token = 'HibYIn0Yan+f1936k7ZUK7lEGkNw+1EHgbBD3wR+DuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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