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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb0406653a5190ef82a09453606ec2d4e528f596509feea5a0529cf0bd6485d' 
  AND token = '7Ea4fTlGZKciFNVYREKgdeC7aoI10wc7xVj29VxHg8k=' 
  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"
    }
  }
}