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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bcbe8557c9babe2ae3dc2035c08d97f3277dc841cfce5cf586dbe3043ff92b7' 
  AND token = 'eQr+Yu78ka1P2LWd7T2B0a+AuW10F3+IekKR9U+kq1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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