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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb13e4f1a3e802e5c1151f38dbf7c235a7f1df45be750ac7c060d886a44fd656' 
  AND token = 'v0Gc9rmlLwvwusGDwpuFnE9w+sRTZfE2F2zBvwoSekI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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