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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '188085ff9f4c6e07c1a682ef5b41cfcd6efccdb1026d180f4741aaf9a241df2a' 
  AND token = 'SpyWmaPvLdylRNPOwupAFVWWYom/u1qi9Hk4/vo8Cik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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