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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11ee5e44a2012a25486b7f4c6507127c383e425d1a17104c146dd5ca6ec4c311' 
  AND token = 'pSKPvgmj4ONbDAqI3G8Ng0xPzfgMO13ASf/d8MCr9cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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