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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a7e89a51cf702c53c39afbb41267054f28f16f8ad895f7f25a9171aaf65d258' 
  AND token = 'aovKaG1JwLs5X8y6xqkrIcihzKF2Cw36TCWkoN5hfno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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