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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3d976d1258b523e8a1fa2579a8d9fa020648d7675c99ed569c45746280833be' 
  AND token = 'v7xMSaE6BB1/Z4f3/RviYgQXwVkT5Vg80I52APra8bI=' 
  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"
    }
  }
}