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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e95eaedfd9dfcca52e859cf33cb7090dba1ab41b41f655771ec24179fa33e705' 
  AND token = 'l/zNMDnXMCll+FUpr/jis3OGC1JpOWmizDFZ5HA75Ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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