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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd534570559ca0cb7cf9e4bac3ed0953edf6294786ece1f8bb54675eb41a35ad1' 
  AND token = 'Iit19Zs4+dmdUjQARWjuaLWG98t7vvtEcZEDC9asmu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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