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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df56eee9db04fbd6f41beb5fd066435d75889ae17eaf8fcf32bed5f380dcc99f' 
  AND token = '9q1IN153X/7o2CHrnVUfPny6fc/XPY5yiqJVFGPXGnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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