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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c72e549285f59360d1d5c39de945260b50aba827b6714c9aed96d948f3bc5a4' 
  AND token = '19+rYMqQwNmSRnnXl30XCHb/u6OYFyGcGPaI9Y0xsEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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