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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06f6bf0cf289dd25e58f707fd2880aea509e370dad6bffc0d66abfdecd67fe01' 
  AND token = 'czTil7sj7lqnEktPVj4uHR/Gylt7DR4dD598/G3wmHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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