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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3af6ba476a678a1d6bb2ffefbfa1c5f75a47e64d74846134df0aa428f4ebc067' 
  AND token = 'o5E0lRoS5Tb2/+YljtQnV7uHC2Qyx4VBPCzM6TZcqog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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