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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2a93e1b1027039e3857ed7ad4b1c61d131cdb7a68fe48eeb3694cc7af50c483' 
  AND token = 'yOUejwjsE0tDWSP8hOuJ9G0prKC221HG/OI0sWbPiaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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