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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd666df3e748424c6ac92bbaba9989fa4d2d6f08b1c520c57cb4f2270cf09053' 
  AND token = 'sDMriZMHZuEFUwd3z2MDEBvr8s+5mzB+uyAkb59ElsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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