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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '134dd9979310d8161aa1c91fa13b1d05e73e5e506387230119aff193f85625d0' 
  AND token = 'XPgRSq74L3jIbYRdexFuISImqRAtmRk99AdIprm/4bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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