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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '272b1291fef7a7b68cd25982c956aad0d7015858a2f04174a666949a08010ba3' 
  AND token = 'DBhPOruzbPzG9F/YbHCCbr75i0MVGoEIc2J955AEwl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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