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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0908cd689ccdbc14abda92220013bd6f84233fb79e9acb0ffebeced68d6e3453' 
  AND token = 'MKie+TAfUXh/ABhO9Kp6P3bKoFsOFMWMGA52/u8J/F0=' 
  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"
    }
  }
}