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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe997504f33d1cfd65f38f7b24a43756d7eaa6170ab21f975b087deaf607195c' 
  AND token = 'Cw4wHJpd2yfFrA59QOU8tMVrARTNZ1hi4f1Cof+Gchk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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