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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fefbba15ca05f5fa460d95035885c02da4aef4786ddf100943c0f9f1e4b6a8f' 
  AND token = 'nExUKnftG33Q9oN5dsyZE2xq28knRQS/s/M5C5GIJu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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