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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '196888eaf3bfbce90eba5b3c7f78402a083d9878c2b9f824631987c24f730345' 
  AND token = 'y0Mp0Y5Y5lzJPfd0kbPAz7QAFjMuaKXXeKKuAtFgtxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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