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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5b978a787585703790af936f11f6d267f7e79f82a74ca200bcef3dae0178a10' 
  AND token = 'w48iwlieHb1V4G9Sx/SHE7c4BP3CijhF9JuzE2EYV4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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