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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a56cc656011fc18b0bbe13584282fb2d753fddf8aa2f0d8a95146ddbf8e3867' 
  AND token = '4b+5lQGOzY3bbZqcc5mIkIQ/Lw6eRvftYAPYvCZNCUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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