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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7631345123a19cd1cdf11dd03d107d3e2bc3752c2f8b3fb033548e98aa5ad4fb' 
  AND token = 'IpOulXgEf7xYaDm5mMlDo2oF78yHvgaXZLI9WP1SQWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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