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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac6e94b0ace8ee895d9800fdd992c6e89b02d3f90a6e6410d4a6ca5fe6c2c15c' 
  AND token = '49AJgBqOM4gUyH3kHGovPZozI3sJKQLhByO2ir9UkfU=' 
  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"
    }
  }
}