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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d78d84134fd905395db270163bf0ed42df9b69dce181c13ed5431d50d6218fc' 
  AND token = 'K/ObsaigAon2rp/cOa8jru4VzRMXgjP9ChoyWhXXfmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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