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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06bfa083c7aeccd5b454e6a0a1604f2e1c14a18f3c55ec1a1b5468ee85a70f99' 
  AND token = 'b947vm7t5iFYOQsA61uA9p/X+B4+/rkkIgYB4edj6qQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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