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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b254978612ab8f7e629c137c283a77ebb539e02ce90b5cc5a0d9895977fe84f' 
  AND token = 'IlWvR90AeKr51ooDb1Q6jnV+/CxvbQM6uoqwfqJ5H6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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