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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b83d797c259f374080c3d587daa3e7deb5869116e5fa9e54836650b4cd1381f1' 
  AND token = '5W1KCYtJ67ewG68I11IBVhR3RFdVhmGy+0ps3RqtrrM=' 
  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"
    }
  }
}