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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92edd5141baf5ee93e4f705bd5f2fd475f279d7ca16ecfd08e92657ea90da4bf' 
  AND token = 'L6jXW+NgPjZdewgKr7mEBvSnMnKuc9aLwdrDGCb3/Zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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