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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7fc24b45563114a06d07ef3824023084bf3464e6d5678847b71baa086f35d6c' 
  AND token = 'EvUPUky/Cy3lso1lFFtGB2UU8wppMaw7vhxda95krK8=' 
  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"
    }
  }
}