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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb0d32dd7fcccfde5399d30e3d067e36b73925b5c72d7898f89fdc9ba34ea5c4' 
  AND token = 'xzE1xVwGnuwmzJu5zA+c2go18/t5pYhpyVY+oQAe0Rw=' 
  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"
    }
  }
}