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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11a28ff1a20ebacd6b02922340d7d9c982e67c7633fb1fc084bd6c5ec5fd18b2' 
  AND token = 'O5cX6S0SHVB9SbLtQiyf0M5KlvjsjxhUBBkB190LSig=' 
  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"
    }
  }
}