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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bada4c578d77faf9169818a7729576bc9572e488ada95e7731b52861e1f19af9' 
  AND token = 'Pc8UVnBsfrs0ejtH1nZibCor+GApyQa/2E6EvQT65k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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