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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cdcca4d96dacf070abaff749b2ab52e99aa7de7970cfc4c99d79ad0c3403c80' 
  AND token = '8FIahbq0U6uColVi+SBpni2QymqSpnUe1RBAhJG5TU4=' 
  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"
    }
  }
}