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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3107ddeceb487dacd74b219d5a5720d7dddbf5886150987252344fa85836b58' 
  AND token = 'VkZTJ7Q1nK3xj88K2J/7m9++3uMkVJB0KldZZV8QqCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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