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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1540a75585f53b9e1e79cf5de7d84a0e3f0497f55b6ca0adfc6d651eb39bdff' 
  AND token = 'F6wlm6tccK5eGBXMoZTO/5L/da4miJ88eq36soEmpzY=' 
  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"
    }
  }
}