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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14b539425387dabda62bd4e18d3f658ff740fb77d07532ceec81c808a0868700' 
  AND token = 'nO9f5Gqp2UoyTlcS2l0NiE7iMBRrLPP+t2YdE9ARK3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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