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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e4c3295118b6e2a212f634b9b193f2d40f1a4575f7c00f2479f7a51b78b7e95' 
  AND token = 'oH6mpLQxkttSbXXBAvj3/b3CE7t7Aim9zw/Go+k6MMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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