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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b396c470d69d12045145da55ef2025dc118d214b178cf45972436407b5e38f0a' 
  AND token = '5vXfA2hkS3p99rh7fmB35AvEoSyOKPHLPA/eJr8qW20=' 
  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"
    }
  }
}