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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf75d875dbe3ee551580d66a4e1093b987eac7f3e15765db29a6ac093b7b68af' 
  AND token = '2Mp4t9uoxLJ5EwpRuwZUqzI545oQu0/QfvVRYnICZtU=' 
  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"
    }
  }
}