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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e7e274e28f09b720f41117c6866ad15a43a17969d146aad5d00e44f371782da' 
  AND token = 'b/knQECsyACuCefZ1PsVQ9L+GIDtP2J/TZ76gLocRKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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