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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d1c23d95383dc726ec3dd51a8b50028f330726e03713f72806f4fcd1035c3d3' 
  AND token = 'HUVpMy88IyCiQsTXEWU9nNwWfo4efr8e54C5MRmtLDE=' 
  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"
    }
  }
}