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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a777acc0ebfbf38fcb364a230b3550f0cf682c7cd1ec48239d560204a2a2fa7' 
  AND token = '3lgR//nvyPq2t7oUG2UpOngi2ODTeH6iGUmLKWhxmD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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