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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f059a387f87fe1b042532b97dee844a8af0871401c254d0c561e25caa442d58' 
  AND token = 'p9fPgXDmbCEDLkl41sPLqHq+QPqt3/7kInjELsvPLog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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