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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '054dd182bb88f7d1db4f4b4c0a3515b0748bf280e5b76e4228dcdf94c5b9e255' 
  AND token = 'h7bvwwIl1+Oyt5hGZqPkUI1OIde8DHiSLuql2lEqGtY=' 
  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"
    }
  }
}