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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8edd3fc7bee7917741324cc1fad8a5275500c46bba5d8c94a81ef73413d9016' 
  AND token = 'wmmDZSa6wOP1XqJspJ9Dvz2Hmobswq6pOtLPJlMwD+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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