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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6410b6c27227ae8d90de4b7723531ec460a628e8653893628155633233df171' 
  AND token = 'cB+ekqccdrm1kQc3/tQEqm1LLS/DGlrV8PLLlqlN+uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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