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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaa5760c1908f9d08a0debafbdeb6e93a4b65a33bf521200fb70b7bf7015566f' 
  AND token = 'AiJMwxx6RJzXoruMZAbg83dPUG9J8ylOM/338IneFYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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