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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da8c282e223d95fd7cfff9c4430b84c5f1e6a530b896695ffa0661fe8e65dc27' 
  AND token = 'TvqOtXE1mVMrs+e6gzGnshq29zSay5UIgv952l3M9vU=' 
  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"
    }
  }
}