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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe3a47ef372beeec8047b1cb09f8148d4dfa64e5508a9ca665a85b6f134ab393' 
  AND token = 'WReZWnJ9yinYkUJz2iqHX8dhlfz0HBuSVOp7+C6E6LM=' 
  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"
    }
  }
}