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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60067a5b1fd8c209fa670518d4c9ce10f566f9d17e9ab1289600c68dc3350842' 
  AND token = '5xX9ZgDur+PwmO5cpYEtrxMOeOv6zc4oP7CFm8wqyDI=' 
  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"
    }
  }
}