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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7973a3b7a1561538b7bc7b2dd8e253aaea4cc47b27d6236c55a7758db388f31' 
  AND token = 'wb58UXUnH7GWAQhKUkhV27RMcBe7EXNcbN/axumV2l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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