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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c74e9fe0a5440394b6569bcb9fc49225890f0b15a512f943ebc03452a7943b7' 
  AND token = 'sep+1XR/iYWOZddmXGgI459SdERYD5KIVn1lyL/8mrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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