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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96303eab8e516f8b35e8394ee4d5f0621fa9263b82ac004a04c0a5b9eea35012' 
  AND token = 'PW094g1vdhgONPuaU0HLzcNOvqE8snJPV2mQ3B+U1fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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