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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d2536d171567677c21e75a048badc0a136735b8c9503f9cbc113e6e6cd6bf92' 
  AND token = 'juaTTcJzz57ouqcF1bMyentWF8TOfolAUqjb44wOiiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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